The crankshaft is one of the most critical and expensive structural components of an internal combustion engine. It is a part (or an assembly of parts in the case of a built-up crankshaft) of complex shape with journals for attaching the connecting rods, from which it receives forces and converts them into torque.
Knowing what a crankshaft is for, it is safe to say that it is subjected to both torsional and bending forces during operation; therefore, to prevent it from failing before its specified service life, its wear resistance must be high.
During operation, the following faults may occur for various reasons:
• wear of the main or connecting rod journals;
• bending;
• crankshaft fracture;
• wear of the mating surfaces for the flywheel, oil seal (seals) and front gear.
If journal wear exceeds the permissible limit or there is a slight bend that can be eliminated by regrinding, the crankshaft is machined to the next repair size.
After the crankshaft journals are reground, their surface hardness, strength and wear resistance are significantly reduced.
To restore their strength and performance characteristics, crankshafts must undergo surface hardening. One of the hardening methods that has proven itself well is liquid nitriding, or nitrocarburizing.
Our company specializes in the surface hardening of parts, and our specialists have already successfully treated dozens of crankshafts.
KAMAZ crankshaft made of 42KhMFA steel, hardened layer hardness 58.5-60.4HRC, layer thickness 0.4mm
